メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.754032307414 43.1949736692946, 141.753378521499 43.1956555534029, 141.752960445302 43.1954457803514, 141.752521885955 43.1952257175774, 141.752490676445 43.1952100391794, 141.75282799709 43.1948580342373, 141.753136790569 43.1945265803365, 141.753175349317 43.1944894036116, 141.753805887513 43.1937923006207, 141.754708657231 43.1942513705795, 141.754032307414 43.1949736692946)) ^^http://www.opengis.net/ont/geosparql#wktLiteral